Most children's CS lunches in WDW are mac&cheese, hamburger, cheese pizza or chicken fingers. Usually there is only a choice of 2 at any particular location. I think that Pinocchio's Village Haus in Fantasyland may offer a deli sandwich. In general, you are probably better off packing a sandwich. I had to do that for Sarah most days because she won't eat most of the CS meals.
You can also order something off the adult menu and it you don't want the sides (like the fries) then you can ask for the item by itself.
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)